Come identificare Brown Trout (Riverine Form)

Per identificare Brown Trout (Riverine Form) (Salmo trutta fario), osserva queste caratteristiche chiave.

Caratteristiche fisiche

Forma del corpo

torpedo

Colorazione

Highly variable depending on habitat, diet, and geographic location. Typically olive-brown to golden-brown on the back, fading to yellowish-white or silvery on the flanks and belly. Characterized by numerous dark spots (often black or dark brown) and distinctive red or orange spots, frequently with a pale halo, scattered across the flanks, dorsal fin, and adipose fin. The intensity and number of spots vary greatly.

Tipo di squame

cycloid

Posizione della bocca

terminal

Caratteristiche distintive

Adipose fin present (a small, fleshy fin between the dorsal and caudal fins)., Vomerine teeth present, typically in a double row., Large mouth extending beyond the posterior margin of the eye., Absence of distinct parr marks in adults (though present in juveniles)., Red or orange spots with pale halos on flanks.

Pinna dorsale

Single dorsal fin, relatively short, with 10-14 rays. Often spotted.

Pinna caudale

Caudal fin typically slightly emarginate (forked) in juveniles, becoming more truncate or square in adults. Often unspotted or with faint spots.

Pinna pettorale

Paired pectoral fins, relatively small, located ventrally.

Pinne distintive

Adipose fin present, often with red or orange spots.

Consigli per l'identificazione

1. 1

   Coloration and Spotting

   Look for the characteristic red or orange spots, often with a pale halo, interspersed with black spots on the flanks. The background color is highly variable but generally brownish or olive.

2. 2

   Adipose Fin

   The presence of a small, fleshy adipose fin between the dorsal and caudal fins is a key salmonid characteristic. In S. trutta fario, it often bears spots.

3. 3

   Mouth Size

   The mouth is relatively large, extending beyond the posterior margin of the eye when closed.

4. 4

   Vomerine Teeth

   Careful examination (often requiring a professional) reveals vomerine teeth in a double row, which helps distinguish it from some other salmonids.

5. 5

   Caudal Fin Shape

   Adults typically have a square or slightly emarginate (less forked than Atlantic Salmon) caudal fin.

Esplora Brown Trout (Riverine Form)